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When calculating the visibility of a target object in road lighting calculations, there is no clearly accepted approach to what should be considered as a background luminance. Different methods may be used such as taking the average background luminance of the bottom and top, right and left, the four sides of the target or the background luminance on that side of the target that leads to the highest contrast. The objective of this study is to show how given background luminances change the VL values for targets. Thus, it is to draw attention and contribute to the need to define the method of background luminance determination which will be accepted as general in VL calculations for the road lighting designs.

EFFECT OF BACKGROUND LUMINANCE CALCULATION METHOD ON VL VALUE